For all their sophistication, today's digital cameras can barely tell the difference in color between indoor lighting, a rainy day outside, or the bright sun. And there is a big difference. Bright daylight tends to look blue, incandescent lighting looks yellow, and fluorescent lighting looks green. The human eye adapts very quickly to the color temperature variations in these light sources so the differences are nearly imperceptible, but your camera isn't that smart.
In portrait photography, wedding photography, and other work where humans are the principal subjects, a true white balance using a gray/white card will NOT deliver pleasing skin tones. A "warmer" white balance is usually what customers and clients prefer, and using WarmCards to customize the color balance of your camera is the way to do it.
The WarmCards Digital Camera Pack (DCP) is smaller, lighter, more portable, and costs less than a regular set of WarmCards used by video professionals. The DCP includes five different shades of pocket-sized WarmCards, a genuine Kodak 18% gray card, and a convenient zippered carrying case to protect them. The DCP can be easily carried in a vest pocket or tucked out of the way in your camera bag for easy use on every shoot.